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A138414 A bisection of A000957. 2
1, 1, 6, 57, 622, 7338, 91144, 1174281, 15548694, 210295326, 2892818244, 40347919626, 569274150156, 8110508473252, 116518215264492, 1686062250699433, 24552388991392230, 359526085719652662, 5290709340633314596, 78201907647506243758, 1160507655117628665252, 17283862221822154612428, 258257655550682547281952 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..22.

PROG

(PARI)

x='x+O('x^100);  v=Vec((1-sqrt(1-4*x))/(3-sqrt(1-4*x)));

vector(#v\2, n, v[2*n-1]) /* show terms */

CROSSREFS

Cf. A000957, A138413.

Sequence in context: A161434 A246235 A213105 * A130565 A124556 A207412

Adjacent sequences:  A138411 A138412 A138413 * A138415 A138416 A138417

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 08 2008

STATUS

approved

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Last modified February 17 18:27 EST 2018. Contains 299296 sequences. (Running on oeis4.)